Method of coiling tensioned strip material about a core portion of cemented strip wraps



Aug. 17, 1965 K. R. CANFOR 3,201,297

METHOD OF COILING TENSIONED STRIP MATERIAL ABOUT A CORE PORTION OF CEMENTED STRIP WRAPS Filed Feb. 15, 1962 FIG. 4

FIG. 3

PRIOR ART INVENTOR KENNETH R. CANFOR ATTO R N EYS United States Patent METHGD 0F COHJNG TENSHONED STRIP MATE- RIAL ABOUT A CORE PORTIDN 6F CEMENTED STRIP WRAlPS Kenneth R. (janitor, Dundas, Ontario, Canada, assign'or to Dominion Foundries and Steel, Limited, Hamilton, Ontario, tlanada Filed Feb. 13, 1962, Ser. No. 173,061 Claims. (Cl. 156184) This invention relates to improvements in processes wherein a strip of sheet material is tightly coiled upon a mandrel, the mandrel being capable of being subsequently collapsed for ready removal of the coil therefrom, and while the invention is particularly applicable in the operation of cold rolling steel strip for reduction in thickness it may be used to advantage in any processes wherein sheet material is under high tension in being coiled upon a collapsable mandrel.

In cold rolling steel strip, a strip of sheet steel in being reduced in thickness is passed to and from through the bite of a pair of workrolls in a reversing cold mill, being alternately coiled upon each one of a pair of rotated reels positioned upon either side of the work rolls, each pass of the strip through the bite of the work rolls reducing the strip in thickness, as for example from an initial thickness of 0.1" to a finished thickness of .010 or less. The reel upon which the final pass is coiled is provided with a collapsable mandrel or arbor capable of being reduced in diameter several inches for ready I removal of the coil therefrom.

As is well known, strip when drawn through the work rolls of a mill is necessarily subjected to considerable tension and therefore a tightly wound coil has an inherent tendency to collapse when support of the mandrel is removed. To prevent coil collapse either one of two techniques have been standard practice. In one, a heavy gauge steel cylinder is fitted upon the expanded mandrel and the coil wound upon the cylinder, the cylinder being removed from the mandrel with the coil and remaining in the coil. In the other technique, a heavy center of about eight to ten wraps of steel. strip in its original thickness is fed onto the mandrel prior to the first reduction pass of the strip through the mill for the purpose of resisting the coil collapsing tension of the finished light gauge steel wrapped upon the coil.

The first technique is not particularly practical under high output conditions due to extra work involved in placing cylinders upon the mandrels and other handling procedures, whereas the second technique is quick but necessitates the loss of a considerable amount of prime steel strip in providing a sufliciently strong crush resisting core.

The object of this invention is to devise a process and suitable apparatus for carrying out the process whereby a crush resistant cylindrical core is providedwithina coil of tensioned strip material, the core being an integral portion of the strip material and made up of a small number of laminated wraps of strip cemented together during initial winding of the coil, and whereby the coherent laminated wraps provide a cylindrical core of suflicient strength to resist internal tensions tending to collapse the coil upon removal from its supporting mandrel.

Though in certain circumstances, the operation may be carried out by hand, a further object of the invention is to provide a suitable apparatus arranged for installation in proximity to a reel upon which a coil of strip material is initially wrapped and through the actuation of which any grease upon the leading end portion of the strip is removed and adhesive applied to both faces of such portion during initial coiling rotation of the strip.

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In order that the invention may be'm'ore clearly understood, reference may be made to the accompanying drawing, which shows one embodiment thereof by way of example, and in which:

FIG. 1 is a schematic side view of a single stand 4-high cold steel strip mill, an apparatus to carry outthe invention being shown installed in proximity tothe reel upon which the strip is finally wrapped.

FIG. 2 is an enlarged plan view of the apparatus.

FIG. 3 is a side view of a finished untreated coil of steel strip and showing the coil collapsed under inherent strip tension, and

FIG. 4 is a similar view to FIG. 3 and showing a coil having a crush resistant core portion formed of several initial wraps of strip cemented together in accordance with the invention.

Though a single stand mill is shown in the drawing, it is to be understood that it merely illustrates an application of the invention. For example, the invention would be just as applicable to a tandem mill or to other analogous apparatus coiling strip under tension.

A single stand mill, as shown in FIG. 1, consists of a pair of power driven work rolls 2 between the bite of which strip is passed for reduction, the work rolls being pressed toward each other by backing-up rolls 3. Two coil strip carrying power driven reels 4 and 5 are positioned one on each side of the mill and which reverse in direction of rotation in synchronism with the work rolls 2 upon completion of each pass of strip through the mill. Deflector rolls 6 and 7 are positioned on both sides of the mill to establish a horizontal strip pass line through the mill, the strip passing thereover and sloping downwardly to the reels.

In practice, a coil of cold steel strip 8 to be reduced in thickness is placed within a pay ofi? device (not shown) and located beyond one of thereels in line with the mill, as for example the reel 5. The lead end of the coil of strip in the pay off device is passed over and above the reel 5, over the deflector roll 7, between the work rolls 2, over. the deflector roll 6 and downwardly to be latched into the winding reel 4. The leading end 9 of the strip is inserted into a slot in a collapsable mandrel 10 carried upon the reel 4; themill then being in readiness for actuation to make the first pass of thestn'p through the nip of the work rolls 2, when such rolls and the reel 4 are rotated in unison. Upon completion of the pass of the stripthrough the mill to coil upon thereel 4, the'tail' end of the strip is latched into the mandrel of the reel 5, which upon reversal of the mill becomes the ceiling reel and the reel 4 the uncoiling reel.

In carrying out the purpose of the invention which resides in cementing together the first several wraps of strip about the mandrel 10, any suitable arrangement, or apparatus as shown in the drawing, may be used. The apparatus shown=comprises an arm 12 extending in alignment with the path of travelof the strip :and'mounted for. vertical swinging movement above the reel 4, an"

air cylinder and piston assembly 13 with usual controls (not shown) is attached to the arm 12 and. provided to actuate the arm in synchronization with the operation of the mill or at the will of the person operating the mill.

The outer end of the arm 12 carries three tubes 14, 15 and 16, sealed at their ends, and extending across the width of the leading end portion of the strip 8 positioned therebeneath. The tubes 14 and 16 each carry a plurality of downwardly directed spaced apart nozzles 17 for the purpose of ejecting fluid adhesive and the tube 15 has spaced apart downwardly directed nozzles 13 for the purpose of ejecting steam. The fluid adhesive is fed to the nozzles 17 from a suitable receptacle through flexible tubing 19 to the arm 12 and connected to a conduit 20 k3 extending inwardly of the arm to connect with the tubes 14 and 16. Steam is fed to the nozzles 13 through a flexible tubing 21 to the arm 12 and connected to a conduit 22 extending inwardly of the arm to connect with the tube 15. Suitable valves, not shown, are provided for controlling passage of adhesive and steam to the respective nozzles.

Operation Before commencing the final pass of strip through the mill to reduce it to its final thickness, for example, as shown in FIG. 1 wherein the finished strip is to be wound upon and finally removed from the reel 4 by collapsing its mandrel 10, the mill is stopped with the strip partly wound around the mandrel, and the arm 12 lowered, as shown. Upon the mill being restarted wherein the reel 4 rotates in unison with the work rolls 2, steam is ejected through the nozzles 18 to play upon the strip for the purpose of scouring the usual coating of grease therefrom, it being apparent that as the strip completes its first coil that the steam Will play upon both surfaces of the strip. Immediately succeeding steam ejection at the moment the first entire wrap of strip is formed, adhesive is ejected through the two sets of nozzles 17 and whereby both faces of the steam scoured strip are adhesive coated. Application of steam and adhesive is permitted to continue during the period of time required to coil the first two or three wraps, after which steam and adhesive ejection is cut off. During the remaining time wherein the strip passes through the mill to be coiled upon the reel 4 the adhsive cures and bonds the first wraps to form a laminated cylindrical core A of about 0.305" wall thickness; the cylindrical core having a collapse resisting strength equivalent to that of a steel insert core of the same wall thickness and serves the same purpose as an insert core in resisting collapse of the coil upon its removal from the reel mandrel.

A bonded laminated core of two or three adhering wraps of steel strip of original thickness is approximately made up of the end length of strip between the reel and work rolls which is never reduced in thickness, the core being equivalent in strength to a heavy standard uncemented core of about eight to ten wraps of original gauge strip fed unto a mandrel with attendant loss of prime material.

In carrying out the invention a quick setting epoxy resin is used for adhesive and steam for removal of grease, the steam heating the strip to allow the adhesive to bond more rapidly. It will be understood that other types of adhesives are usable and that a sprayed degreasing agent, such as chlorothene may be used in place of steam, it being furthe apparent that the object of the invention may be attained by apparatus other than that shown and described or by the use of an adhesive un affected by grease; or in certain instances application of the adhesive and degreasing agent may be performed by hand Without departing from the scope of the invention as defined in the appended claims.

What I claim as my invention is:

1. A method of providing an integral crush resistant core within a coil of tensioned strip material as the strip material is coiled upon a rotated supporting mandrel, the method including the steps of connectedly engaging the lead end of the strip with the mandrel, rotating the mandrel to effect coiling of the strip thereon, applying to at least one face of the lead end portion of the strip material, which portion constitutes the first several overlapping turns of the resultant coil, and as the said lead end portion is coiled upon the mandrel, an adhesive which bonds together said first several overlapping turns to form said crush resistant core, and thereafter coiling the remainder of the strip without adhesive between the turns thereof into a coil upon the thus formed laminated crush resistant core.

2. A method as claimed in claim It, and including the step prior to the application of the adhesive of heating the strip to increase the speed of bonding together of said first several overlapping turns by said adhesive.

3. A method of providing an integral crush resistant core within a coil of tensioned cold steel strip as the strip material issues from the Work rolls of a rolling mill and is coiled upon a rotated supporting mandrel, the method including the steps of connectedly engaging the lead end of the steel strip with the mandrel, rotating the mandrel to effect coiling or" the steel strip thereon, applying to at least one face of the lead end portion or" the steel strip, which portion constitutes the first several overlapping turns of the resultant coil, and as said lead end portion is coiled upon the mandrel, an adhesive which bonds together said first several overlapping turns to form said crush resistant core, and thereafter coiling the remainde of the steel strip without adhesive between the turns thereof into a coil upon the thus formed laminated crush resistant core.

4. A method as claimed in claim 2, and including the step, prior to the application of the adhesive to said at least one face of the strip, of the application of a degreasing fluid to said at least one face.

5. A method as claimed in claim 3, and including the step, prior to the application of the adhesive to said at least one face of the strip, of the application of a heated degreasing fluid to said at least one face, the heated fiuid heating the strip to increase the speed of bonding together of said first several overlapping turns by said adhesive.

References Cited by the Examiner UNITED STATES PATENTS 642,976 2/00 Grigg 156-446 1,198,046 9/16 Miller 11749 2,202,563 5/40 Mikaelson 242-781 2,3 32,293 10/43 Blodgett 24278.1 2,361,795 10/44 Roesen 24256 FOREIGN PATENTS 128,509 7/48 Australia.

388,162 2/33 Great Britain.

EARL M. BERGERT, Primary Examiner.

J. P. STRIZAK, Examiner. 

1. A METHOD OF PROVIDING AN INTEGRAL CRUSH RESISTANT CORE WITHIN A COIL OF TENSIONED STRIP MATERIAL AS THE STRIP MATERIAL IS COILED UPON A ROTATED SUPPORTING MANDREL, THE METHOD INCLUDING THE STEPS OF CONNECTEDLY ENGAGING THE LEAD END OF THE STRIP WITH THE MANDREL, ROTATING THE MANDREL TO EFFECT COILING OF THE STRIP THEREON, APPLYING TO AT LEAST ONE FACE OF THE LEAD END PORTION OF THE STRIP MATERIAL, WHICH PORTION CONSTITUTES THE FIRST SEVERAL OVERLAPPING TURNS OF THE RESULTANT COIL, AND AS THE SAID LEAD END PORTION IS COILED UPON THE MADREL, AN ADHESIVE WHICH BONDS TOGETHER SAID FIRST SEVERAL OVERLAPPING TURNS TO FORM SAID CRUSH RESISTANT CORE, AND THEREAFTER COILING THE REMAINDER OF THE STRIP WITHOUT ADHESIVE BETWEEN THE TURNS THEREOF INTO A COIL UPON THE THUS FORMED LAMINATED CRUSH RESISTANT CORE. 